What are some alternatives?
youtube-dl - A small command-line program to download videos from https://alternativeto.
Peggo.tv - Peggo is a free YouTube to mp3 converter online.
yt2mp3.org - Free online YouTube to MP3 Converter
4k Video Downloader - 4K Video Downloader is a software program that helps people download video files from sites such as Facebook, YouTube and Dailymotion.
YoutubeDownloader - YouTube Downloader is a best in the class video downloader for the Opera web browser.
Point MP3 - Pointmp3 is one of the best and an easiest online tool that helps you to converts your favourite tracks on YouTube to the mp3 format that is of the highest quality.